GB2125867A - Tilting window - Google Patents

Abstract

A wing frame 4 is mounted on plates 7 pivotally connected 22 to arms 9 pivoted on the main frame 1 at a fixed axis 10 and short arms 13 pivoted intermediate the ends of struts 12 which are pivotally connected to the arms 9 at 23 and to sliders 18 in the main frame at 21. In the closed position (Fig. 1) the axes 10, 21, 22 and 23 are in a straight line and the axes 28 and 29 in arm 13 are in a line at an acute angle to it. In the fully open position the wing can be cleaned on both sides. <IMAGE>

Description

SPECIFICATION Pivot bearing in the form of a scissor-shaped lever system for turning or tilting casements, in particular outwardly opening casements of doors, windows or the like The invention relates to a pivot bearing in the form of a scissor-shaped lever system for turning or tilting casements, in particular outwardly opening casements of doors, windows, also dormer windows or the like.

A pivot bearing with features of the type in question is known from the US Patent Specification 28 25 939. This is, however not suitable for casements with an external overlap.

The known pivot bearing also requires a particular pressing and locking projection. Its relatively long members may be easily bent or broken in the case of heavy casements.

In particular in the case of outwardly opening turning or tilting casements, the cleaning of the outer side of the casement is practically only possible when there is a free cleaning aperture in the open position of the casement between the blind frame and the casement frame in the region, of the casement, on the hinge side, through which aperture the outer face of the casement is accessible. Pivot bearings in the form a scissor shaped lever system are therefore provided for this type of casement, which pivot bearings are in each case mounted on two opposite narrow sides in the groove between the casement frame and the blind frame and support the casement when it moves between the closed position and the open position.In the case of known lever systems of this type, three lever members, namely the scissor arm, the carrier arm and the guide rod are in each hinged to the blind frame, the scissor arm being hinged rigidly and the two other lever system members being hinged movably at the blind frame by means of a sliding part which is movably guided on the blind frame (cf. US Patent Specification 27 84 459 and German Auslegeschrift 22 37 669). These known pivot bearings may, however, only be used for relatively light casements since with greater weights the carrier arm and the guide rod are subjected to excessive bending forces.This is determined by the relatively great length of the lever system members which is necessary in order that the casement overlap * may be reliably freed from the blind frame out of its abutting and overlapping position when the casement is opened and the cleaning aperture is formed. The use of stronger lever system members is limited by the width of the groove between the blind frame and the casement frame. In order to increase the bearing capacity of the bearing, in the case of a known construction (German Auslegeschrift 22 37 669) an additional guide rod is provided which is arranged approximately parallel to and at a distance from the guide rod, hinged to the sliding part between the scissor arm and the carrier arm.Since it is also necessary in this case for the two guide rods to be relatively long, nothing is essentially changed with respect to the existing problem and the lever system per se is only heavier, more expensive and is more liable to disorders owing to the greater number of parts.

In the case of the pivot bearing of the type in question it is also known to allow the two hinge points of the carrier arm and the guide rod to coincide at the sliding part such that there is a connection in the manner of a hinged rectangle (cf. US Patent Specification 33 45 777) between the casement frame, the scissor arm, the carrier arm and the guide rod.

In the case of all these known pivot bearings it is necessary to provide an engagement projection at the narrow side of the casement frame for the reliable guiding of the casement frame into its closed position, with which engagement projection a catch plate is associated at the facing narrow side of the blind frame, into which catch plate the projection runs when the casement is closed. As a result of this it is reliably ensured that the casement cannot be removed outwardly at random in its closed position, in which all the lever system mebers are aligned with respect to one another.

It is possible by means of the invention to produce such a pivot bearing in such a manner that with a simple construction, an essentially increased bearing capacity of the scissor-shaped lever system is obtained such that the pivot bearing is also suitable for larger casements with multiple glazing, without the materials having to be of greater strengths or more expensive.

According to the invention there is provided a pivot bearing in the form of a scissor-shaped lever system for turning or tilting a casement in particular for a casement whose opening is directed outwardly, of a door or window (including a dormer window) or the like, in the case of which in the openg position of the casement, there is a cleaning aperture between the hinge side of the casement and the rigid blind frame comprising a scissor arm rigidly hinged with its two ends to a blind frame and a casement frame, a carrier arm, which is approximately parallel to the plane of the casement frame, hinged at one end to the scissor arm and at the other end to a sliding part which is displaceably guided on the blind frame parallel to the plane of the blind frame, and a guide rod which is hinged at the carrier arm and in the region of the casement frame on the hinge side, in the closed position all the hinge points between the scissor arm, the casement frame and the carrier arm lying on a common straight line, characterized in that the relation of the distances of the hinge points between the casement frame, the scissor arm, the carrier arm and the guide rod is selected such that the connection line between the two hinge points of the guide rod forms an acute angle with the straight line of the hinge points between the scissor arm, the casement frame and the carrier arm, in such a way that the region, on the hinge side, of the casement frame is locked against removal from the blind frame by automatic locking of the lever system.

In a preferred embodiment (described hereinafter with reference to drawings, the hinge point, remote from the casement frame, of the guide rod on the carrier arm participates in the pivoting movements of the carrier arm when the casement is opened. As a result of this pivoting movement the hinge point of the guide rod is automatically pivoted out of the region of the mounting groove by the carrier arm. The guide rod itself is constructed so as to be shorter by this pivoted-out amount without the freeing of the outer overlap of the casement frame from the blind frame being endangered or impaired during opening. The substantially shorter construction of the guide rod with respect to known pivot bearings of this type essentially reduces the bending strain of this guide rod.In this connection, the effective length of the guide rod may be selected such that it is so short that a mounting plate, bearing the hinge points of the lever system, remains such that it laterally partially overlaps the carrier arm in practically all admissible relative pivoting positions of the casement frame with respect to the blind frame.

The casement frame is therefore directly supported on the carrier frame such that the guide rods may be maintained practically completely free from bending forces. An additional guide rod (as is provided in the case of the pivot bearing according to the German Auslegeschrift 22 37 669 for increasing the bearing force of the pivot bearing) is not required here.

Owing to the short effective length of the guide rod it is constructed and disposed with such respect to the remaining lever system members such that in the closed position, in which the scissor arm and the carrier arm in the mounting groove are in direct mutual alignment and in alignment with the casement, the connection line of the hinge points of the guide rod forms an acute angle with the connection points of the remaining lever system members at the casement frame.

This means that, in the closed position, the scissor arm and the carrier arm are in the extended position, but the guide rod and the carrier arm are almost in the extended position. As a result of the automatic locking of the lever system caused thereby, the casement in its closed position is automatically locked against removal, such that particular latching or locking members are not required to secure the casement. The open position is determined by the abutment of the slide at a stop in the sliding guide of the blind frame.

The construction of the pivot bearing enables it to be ensured that the casement edge on the hinge side remains in its abutting and overlapping position with the facing edge of the blind frame during the movement of the casement from the closed position into a ventilation end position and is only removed from this abutting and overlapping position when the casement is moved beyond the ventilation end position towards the open position. As a result of this the pivot bearing may also be used for sky-light or dormer windows since the penetration of rainwater may be reliably prevented in all positions until the ventilation end position is reached.

The invention will now be described by way of example with reference to the accompanying drawings, which illustrate the above-mentioned preferred embodiment.

In the drawings: Figure 1 shows a plan view of the installed pivot bearing embodying the invention in the closed position of the casement; Figure 2 shows a side view of the pivot bearing according to Figure 1; Figure 3 shows a cross-section along the section line A-B of Figure 2; Figure 4 shows a cross-section along the section line C-D of Figure 2; Figure 5 shows the pivot bearing in the end ventilation position, in a similar representation as Figure 1; and Figure 6 shows the pivot bearing with the casement in the open position in the same representation.

Referring to the drawings, there is shown a blind frame 1 having an outwardly directed side 2 and a side 3 thereof facing the interior. A casement frame 4 is only indicated diagrammatically in chain-dot lines.

A pivot bearing 5 in the form of a scissorshaped lever system comprises an angle plate 6, a leg 7 of which is formed as a casement mounting plate, whilst a leg 8 of angle plate 6 engages over the adjacent narrow side of the casement. The angle plate 6 is rigidly secured to the narrow sides of the casement frame. The casement mounting plate 7 bears a rigid hinge point 22 for one end of a scissor arm 9, the other end of which is hinged rigidly at 10 to the blind frame or a securing plate 1 5 formed as a sliding guide. At a slight distance from the hinge point 22 of the casement screw-on 7, the free end of a carrier arm 12 is hinged at 23 to the scissor arm 9. The other, or inner, end of the carrier arm 12 is hinged at 21 to a sliding part 18 which is movably guided at the blind frame in the sliding guide 1 5 parallel to the plane of the blind frame.

At the carrier arm 12, at a predetermined distance, designated 41, from the hinge point 21 of the carrier arm 12 one end of a guide rod 13 is hinged to the sliding part 18 at 28, the other end being hinged to the casement screw-on plate 7. In comparison to the installation width of the lever system parts of the pivot bearing, the guide rod 13 has only a relatively short length. This is most evident in the closed position of the pivot bearing according to Figure 1. In this closed position the lever system parts, namely the scissor arm 9 and the carrier arm 12 are directly aligned with respect to one another and with respect to the casement screw-on plate 7, such that the scissor arm 9 and the carrier arm 7 are in the direct extension position, i.e. the associated hinge points lie on a common straight line 30. The connection line 31 between the hinge points 28, 29 of the guide rod 13, however, form an acute angle 40 in the closing position with the line 30 of the remaining hinge points, i.e. the guide rod 1 3 and the carrier arm 12 are almost in the extended position.

In spite of the oblique position of the guide rod 13 the ends of the guide rod 13 practically do not project beyond the installation width of the pivot bearing.

The short effective length of the guide rod 13 is also evident from the fact that, as a comparison of Figures 1, 5 and 6 shows, in practically all admissible positions between the blind frame 1 and the casement frame 4 the casement screw-on plate 7 remains such that is laterally overlaps the carrier arm 12 to a greater or lesser extent. The casement may thus be constantly supported via the casement mounting plate 7 at the carrier arm 12. This is also achieved by the short effective length of the guide rod 1 3. Owing to its short length, on the one hand, and, on the other, as a result of the lateral overlapping between the casement screw-on plate 7 and the carrier arm 12, the guide rod 1 3 is almost completely free of bending forces.As a result of the compact type of construction the pivot bearing may be extremely highly stressed and is thus also suitable for heavy and multi-glazed casements. The oblique position of the guide rod 1 3 in the closed position according to Figure 1 in addition leads to the fact that in the closed position the scissor-shaped lever system automatically locks itself such that in the closed position it is not possible to remove the casement 4 outwardly from the blind frame 1 from the exterior. Therefore no additional latching or locking measures are required for the closed position of the casement. Thus a scissor-shaped lever system is obtained which may be highly stressed, is of very simple construction and is also particularly cheap to manufacture.

In Figure 5 the casement 4 is shown in the ventilation end position. It may be seen that, owing to the construction of the lever-system, the casement edge 25 on the hinge side still abuts and overlaps the edge 26, facing it, of the blind frame 1. Therefore, on the hinge side, the sealing between the blind frame 1 and the casement frame 4 is ensured between the closed position and the ventilation end position. Thus the pivot bearing is also in particular suitable for skylights or dormer windows, since, as a result of the sealing abutment, the penetration of rain-water from above is eliminated. It is only when the casement 4 is pivoted further out of the ventilation end position according to Figure 5 into the open position according to Figure 6 that the casement edge 25 lifts from the blind frame edge 26, forming the cleaning aperture 32. The open position of the casement 4 is determined by the abutment of the sliding part 1 8 at a stop part 1 9 which is secured to the guide rail 1 5 and may also bear the pivot bearing 10 for the scissor arm 9.

Claims (3)

1. A pivot bearing in the form of a scissor shaped lever system for turning or tilting a casement, in particular for a casement whose opening is directed outwardly, of a door or window (including a dormer window) or the like, in the case of which, in the open position of the casement, there is a cleaning aperture between the hinge side of the casement and the rigid blind frame comprising a scissor arm (9) rigidly hinged with its two ends to a blind frame and a casement frame, a carrier arm (12), which is approximately parallel to the plane of the casement frame, hinged at one end to the scissor arm (9) and at the other end to a sliding part (18) which is displaceably guided on the blind frame parallel to the plane of the blind frame and a guide rod (13) which is hinged at the carrier arm (12) and in the region of the casement frame (4) on the hinge side, in the closed position all the hinge points between the scissor arm, the casement frame and the carrier arm lying on a common straight line, characterized in that the relation of the distances of the hinge points (22,23, 28,29) between the casement frame (4), the scissor arm (9), the carrier arm (12) and the guide rod (13) is selected such that the connection line (31) between the two hinge points (28,29) of the guide rod (13) forms an acute angle (40) with the straight line (3) of the hinge point between the scissor arm, the casement frame and the carrier arm, in such a way that the region, on the hinge side, of the casement frame (4) is located against removal from the blind frame (1) by automatic locking of the lever system (5).

2. A pivot bearing as claimed in claim 1, characterized in that the effective length (28-29) of the guide rod (1 3) - in relation to the standardized installation width of the lever system members - is dimensioned so short that essentially in all admissible relative positions of the blind frame (1) and the casement frame (4), a casemount mounting plate (7), bearing the hinge points (22, 29), laterally overlaps the carrier arm (12) at least partially according to its width.

3. A pivot bearing as claimed in claim 1 or 2, characterized in that the effective length of the guide rod (13) and the distance (41) of its hinge point (28) on the carrier arm (12) from the hinge point (29) on the sliding part (18) are dimensioned such that the casement edge (25), on the hinge side, remains in the region between the closed position and a predetermined ventilation end position such that it abuts and overlaps the edge (26), facing it, of the blind frame (1) and only moves away therefrom when the cleaning aperture (32) is formed and the casement (4) moves beyond the ventilation end position.